Composite brake drum



April 1936. D. J, CAMPBELL:- I 7,

COMPOS ITE BRAKE DRUM Original Filed Nov. 15, 1955 2 A1Tomewg Patented Apr. 14,

2.037.212 COMPOSITE BRAKE DRUM Donald J. Campbell, Spring Lake Township, Ottawa County, Micln, assignor to Campbell, Wyant & CannonFoundry Company, Muskegon, Micln, a' corporation of Michigan.

Original application November 13, 1933, Serial No. 697,817. Divided and this application May 24, 1934, Serial No. 727,236

.9 Claims. (Cl. 188-218) This invention relates to a brake drum.

The subject matter of this application is a divis on of my Patent No. 2,004,061 granted June 4, 1935.

The invention consists of a drum which is produced by providing a supporting shell, heating the shell sufilciently to prevent chilling of molten copper, revolving the shell slowly in a suitable mechanism, depositing into the shell a measured quantity of 'molten iron that has been alloyed with copper, increasing the rate of rotation 'while the iron is in a molten state until a suflicient quantity of the copper is driven to the/inner peripheral surface of the shell and separates the molten iron from the shell by a thin layer of copper, the copper being joined to the shell and to the iron as by fusion.

In the drawing:

Fig. 1 is a side view of a pair of my drums.

. Fig. 2 is a view in section taken along the line 2-2 of Fig. 1.

Fig. 3 illustrates the severing of the pair of drums.

Like numerals refer to like parts throughout the several views.

Numeral i indicates the outer supporting shell, preferably formed of steel, this being ribbed outwardly as indicated at H and-having inwardly extending flanges l2 as clearly shown in Figs. 2 and 3.

Numeral 13 indicates the cast iron and numeral N indicates the copper although it is to be copper, due to its higher specific gravity, is thrownand segregated outwardly more or less against the inner face of the steel shell H with a result that the heat from the molten mixture is transferred thereto and consequently a proper fusion or juncture is attained between the inner side of the steel shell and the braking band.

In carrying out the invention it is desirable to first melt the iron in a cupola, transfer it to an electric furnace and introduce the desired quantity of copper and other alloys and where the whole mass of iron and alloys is brought to the desired temperature for depositing into the revolving heated shell. It has been found that the quantity of copper may vary between 2 percent and percent and in some cases even more,

but for good results a percentage of 4 percent.

' necessarily limited to a copper alloy as the copper may be replaced by any other metal which has Y a melting point high enough to cause the functions herein stated among which is proper fusion and which metal must also have a density ,greater than the density of cast iron.

Having thus described my invention, what I desire to claim is as follows:

1. A composite brake drum for vehicles comprising a sheet steel supporting shell, a cast iron braking ring and a layer of copper interposed between the said ring and the shell, the said layer of copper being fused to the inner periphery of the shell and to the exterior periphery of the iron. ring.

2. A brakedrum of the class described comprising, a cast iron ring and a layer of copper therearound, said copper being fused to the said cast iron.

3. A composite brake drum for vehicles and the like comprising a cast iron braking ring, a steel supporting shell and a layer of copper alloy disposed therebetween.

4. A brake drum comprising a steel supporting shell and a layer of copper alloy disposed therein.

5. A brake drum comprising a steel supporting shell and a layer of copper alloy disposed therein, said copper alloy having a variable density.

'6. A brake drum comprising a steel supporting shell and a layer of copper alloy disposed therein, said copper alloy having a variable density, the density being maximum at points immediately adjacent to the steel supporting shell.

7. A brake drum comprising an outer shell, a layer of copper disposed therein and a cast iron ring located interiorly of said layer of copper, said cast iron ring being fused to the layer of copper.

8. A composite brake drum comprising three concentric bands snugly engaging one another.

the central band being formed of a metal which has a higher density than the inner band.

9. A brake drum as defined in claim 8 in which the metal of the central band has a higher melt ing point than the inner baud.

DONALD J. CAMPBELL. 

